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Hideo Maeda
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Tokyo, JP
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last 30 patents
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Patent Grant
Optical pick-up device and method using a high-density double diffr...
Patent number
5,956,302
Issue date
Sep 21, 1999
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical encoder having high resolution
Patent number
5,812,320
Issue date
Sep 22, 1998
Ricoh Company, Ltd.
Hideo Maeda
G02 - OPTICS
Information
Patent Grant
Optical encoder having high resolution
Patent number
5,652,426
Issue date
Jul 29, 1997
Ricoh Company, Ltd.
Hideo Maeda
G02 - OPTICS
Information
Patent Grant
Encoding apparatus for making measurements of two-dimensional displ...
Patent number
5,579,111
Issue date
Nov 26, 1996
Ricoh Company, Ltd.
Hideo Maeda
G01 - MEASURING TESTING
Information
Patent Grant
Optical encoding apparatus for measuring displacement of an object...
Patent number
5,574,558
Issue date
Nov 12, 1996
Ricoh Company, Ltd.
Kouichi Kudo
G01 - MEASURING TESTING
Information
Patent Grant
Infinitesimal displacement measuring apparatus and optical pick-up...
Patent number
5,572,323
Issue date
Nov 5, 1996
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Light source device and optical pickup using light source device
Patent number
5,331,650
Issue date
Jul 19, 1994
Ricoh Company, Ltd.
Hideo Maeda
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Wavelength converting element and system for recording and reproduc...
Patent number
5,325,348
Issue date
Jun 28, 1994
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pick-up for use with an opto-magnetic signal
Patent number
5,278,817
Issue date
Jan 11, 1994
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optomagnetic recording/reproducing apparatus
Patent number
5,115,423
Issue date
May 19, 1992
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,107,477
Issue date
Apr 21, 1992
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical information recording/reproducing apparatus
Patent number
5,101,389
Issue date
Mar 31, 1992
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,097,462
Issue date
Mar 17, 1992
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Diffraction grating having incident and emitting side gratings
Patent number
5,093,749
Issue date
Mar 3, 1992
Ricoh Company, Ltd.
Hideo Maeda
G02 - OPTICS
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,060,212
Issue date
Oct 22, 1991
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical reproducing apparatus
Patent number
5,029,154
Issue date
Jul 2, 1991
Ricoh Company, Ltd.
Yuji Sumi
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical head device for recording and reproducing information
Patent number
4,935,911
Issue date
Jun 19, 1990
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE